Technically, this is a manual focus lens, insofar as there's no motor drive to be found, but that term is a little deceiving. Standard manual focus lenses have a focus ring that you turn to adjust your focus. This is not the case with the MP-E 65mm. The adjustment ring on the MP-E 65mm is used to set your magnification and you move your camera to adjust or fine-tune the focus. In a roundabout way, you can fine tune the focus by turning the lens ring but in doing so, you affect the magnification ratio. In some cases this won't make any difference in the appearance (can you tell the difference between 4:1 and 3.75:1 magnification at a quick glance?) but I found it easier to fine tune the focus by moving the camera. If you are serious about this lens, you should consider a set of rails for ultra-fine distance adjustments.